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uitrit tartas gamut @fing Letter@ Patent No. 76,171, and Marca e1, 186s.

IMPROVEMENT IN BQRlNG-MAGHINES.

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To ALL WHoM IT MAY coNoERN:

Beit known that we, HUGH DOOL and PHILO B. WHITE, of Dowa'giac, in the county'of Cass, and inthe State of Michigan, have invented certain new and useful Improvements in Boring-Machines; and do hereby declare that the following is a. full, clear, and exact description thereof, reference beinghad to the accompanying drawings, and the letters of reference marked thereon.

In the annexed drawings, making a part of th-is'speeication, A-represents a frame of suitable size and I strength, and is provided with cross-beams z. h, as shown in the drawings. ,A horizontal shaft, B, is adjusted in any suitable ror convenient mannervacross and to the frameA near its top. Upon this shaft is rigidlysecured the pinion C near one of its ends, and, loosely adjusted, the movable cog-wheel D near" the other end of said shaft. The shaft B is provided with a suitable groove, in whichts and is secured a double catch-spring, g, which is provided with two shoulders. `The spring g fits in a-groove in the hole of the wheel D, and holds it from turning on its shaft, and the shoulders thereof. hold, said wheel in the required position, so it will mesh with either one or the other ofthe cog-wheels E or F, as may bedesired. A shaft, K, is adjusted'vertioally in the `middle of the frame, upon orv by means of the cross-beams 7L z, upon which are rigidly secured, at its upper end, thebevelled oog-wheels E and F, and to its lower end a suitable socket or device, P, for holding an auger, bit, or borer which may be adjusted therein.' The shaft K is movable vertically, andris adjusted'or heldV at any place desired by means of a collar, L, which i'its loosely around it, but which is made stationary by means of the set-sorew :n whenever the same may-be required.

It is often desirable to change the speed of the borer to suity the ditferenee inthe hardness or solidity of the wood or material to be bored. This object is very conveniently attained by the above-described device, by adjusting the collar L on the shaft vK, so as to let the same down to the required position, and then slipping the wheel D ou thejshaft B, so it will mesh with the wheel E and fasten said wheel D. By means of the shoulder on-the spring g, a comparatively rapid motion or greater-speed is given. to the auger orbore in the socket P. To make the motion of the borer slower, or to give the same less speed by the same power, applied as above, press the spring g down, and then slip the wheel D out against the shoulderrof said spring, and then loose the set-screw :v and slip the shaft Kiup through the collar L, so that the wheel F willmesh with -themovable wheel D. The difference in the'speed of the borer will ofcourse depend upon the diiferenoe in the diameter of the wheels E and F, which diierence may be as great as, in practice, is found most desirable. It will be seen, a

however, that the bottom or lower wheel, F,-must always be the larger of the two.

Having thus fully described our invention, whatwe claim as new, and desire to secure by Letters Patent, is-

The adjustable shaft K, provided with wheelsE and ,F,'of. different diameters, in combination with the horizontal shaftB, provided with an adjustable wheel, D, when constructed and used substantially as and for the purpose specified. A A j In testimony that we claimthe foregoing, we have hereunto set our hands, this 13th day of January, 1868.

HUGH DooL, PHIL@ B. WHITE.'

Witnesses EALHEN. A. HUH, Pans. H..W1nr1i. 

